Cannot convert value of type Int to expected Argument type '...'

Question

I was trying to understand how parameters work in Swift and thus wrote a simple class as follows

class NumberIncreaser { func numberIncrementor(var number:Int)->Int{ number += 1 return number } var anotherNumber = numberIncrementor(3) }

However even after explicitly mentioning that the method 'numberIncrementor' takes an Int , Xcode asks for a numberIncreaser object(hope I am using the correct terminology , new to programming) instead. I noticed that when I remove the class the method works perfectly fine. I would like to know why this is so and how can I resolve it.

Thanks!

You problem is in performing code in scope of class. You need to do that in scope of methods or global scope. — Igor B.
– Igor B., Commented May 30, 2016 at 14:31

orxelm · Accepted Answer · 2016-05-30 14:33:32Z

Also, don't use var in func parameter declarations:

class NumberIncreaser { static func numberIncrementor(number: Int) -> Int { let answer = number + 1 return answer } } var anotherNumber = NumberIncreaser.numberIncrementor(3)

Ahmed Onawale · Accepted Answer · 2016-05-30 14:43:13Z

var parameters have been deprecated thus number is a constant which makes it immutable. You also cannot call numberIncrementor because it's an instance method.

A way out would be to make numberIncrementor a class or static method by prefixing the declaration with class or static keyword: class func numberIncrementor and you call it like so: NumberIncreaser.numberIncrementor(3).

class NumberIncreaser { class func numberIncrementor(number: Int) -> Int { return number + 1 } var anotherNumber = NumberIncreaser.numberIncrementor(3) }

Another way would be to make anotherNumber a lazy property like so:

class NumberIncreaser { func numberIncrementor(number: Int) -> Int { return number + 1 } lazy var anotherNumber: Int = self.numberIncrementor(3) }

Igor B. · Accepted Answer · 2016-05-30 14:59:17Z

Your code won't compile. Consider this:

class NumberIncreaser { static func numberIncrementor(var number:Int)->Int{ number += 1 return number } } var anotherNumber = NumberIncreaser.numberIncrementor(3)

Or one another variant:

class Number { var number: Int init(number: Int) { self.number = number } func increasedNumber() -> Int { return number + 1 } } var anotherNumber = Number(number: 3).increasedNumber()

This would definitely work. But, how would you do it if the condition is that another number has to be initialized inside the class?
@AkshanshThakur Consider the second variant. Does it answer to you question?
Wait, i understood. Good job, I'll spend some time on it. Thanks for the response.

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